Interesting video on lifters

With what comes out of most boxes of lifters these days, the amount of chamfer on a set of 16 can vary greatly.
From almost nothing to “wow!!”.
This past spring I had some normal Hyd lifters here....... from the last of the US made suppliers.
The pattern on the base looked much nicer than what was in the video...... but a handful had a seriously large chamfer.
I looked at a few with the bigger chamfer under a magnifying glass, and eyeballed the effective foot diameter with a caliper.
They were down from .904 OD to about .875.
Fortunately, the cam they were being paired with was designed for use with .842 diameter lifters.

I have a set of NOS Crane Hyd lifters here from the 80’s.
Almost zero chamfer.
My friends Trend tool steel lifters for his stocker have basically zero chamfer.

The giant chamfer thing seems to be somewhat recent(within the last few years or so). At least, I don’t recall noticing it before that and none of the older lifters I have here are like that, and I’m sure it has contributed to some cam failures.